2 * PCI Express PCI Hot Plug Driver
4 * Copyright (C) 1995,2001 Compaq Computer Corporation
5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2001 IBM Corp.
7 * Copyright (C) 2003-2004 Intel Corporation
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19 * NON INFRINGEMENT. See the GNU General Public License for more
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 * Send feedback to <greg@kroah.com>,<kristen.c.accardi@intel.com>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/types.h>
33 #include <linux/signal.h>
34 #include <linux/jiffies.h>
35 #include <linux/timer.h>
36 #include <linux/pci.h>
37 #include <linux/interrupt.h>
38 #include <linux/time.h>
39 #include <linux/slab.h>
44 static inline int pciehp_readw(struct controller *ctrl, int reg, u16 *value)
46 struct pci_dev *dev = ctrl->pcie->port;
47 return pci_read_config_word(dev, pci_pcie_cap(dev) + reg, value);
50 static inline int pciehp_readl(struct controller *ctrl, int reg, u32 *value)
52 struct pci_dev *dev = ctrl->pcie->port;
53 return pci_read_config_dword(dev, pci_pcie_cap(dev) + reg, value);
56 static inline int pciehp_writew(struct controller *ctrl, int reg, u16 value)
58 struct pci_dev *dev = ctrl->pcie->port;
59 return pci_write_config_word(dev, pci_pcie_cap(dev) + reg, value);
62 static inline int pciehp_writel(struct controller *ctrl, int reg, u32 value)
64 struct pci_dev *dev = ctrl->pcie->port;
65 return pci_write_config_dword(dev, pci_pcie_cap(dev) + reg, value);
68 /* Power Control Command */
70 #define POWER_OFF PCI_EXP_SLTCTL_PCC
72 static irqreturn_t pcie_isr(int irq, void *dev_id);
73 static void start_int_poll_timer(struct controller *ctrl, int sec);
75 /* This is the interrupt polling timeout function. */
76 static void int_poll_timeout(unsigned long data)
78 struct controller *ctrl = (struct controller *)data;
80 /* Poll for interrupt events. regs == NULL => polling */
83 init_timer(&ctrl->poll_timer);
84 if (!pciehp_poll_time)
85 pciehp_poll_time = 2; /* default polling interval is 2 sec */
87 start_int_poll_timer(ctrl, pciehp_poll_time);
90 /* This function starts the interrupt polling timer. */
91 static void start_int_poll_timer(struct controller *ctrl, int sec)
93 /* Clamp to sane value */
94 if ((sec <= 0) || (sec > 60))
97 ctrl->poll_timer.function = &int_poll_timeout;
98 ctrl->poll_timer.data = (unsigned long)ctrl;
99 ctrl->poll_timer.expires = jiffies + sec * HZ;
100 add_timer(&ctrl->poll_timer);
103 static inline int pciehp_request_irq(struct controller *ctrl)
105 int retval, irq = ctrl->pcie->irq;
107 /* Install interrupt polling timer. Start with 10 sec delay */
108 if (pciehp_poll_mode) {
109 init_timer(&ctrl->poll_timer);
110 start_int_poll_timer(ctrl, 10);
114 /* Installs the interrupt handler */
115 retval = request_irq(irq, pcie_isr, IRQF_SHARED, MY_NAME, ctrl);
117 ctrl_err(ctrl, "Cannot get irq %d for the hotplug controller\n",
122 static inline void pciehp_free_irq(struct controller *ctrl)
124 if (pciehp_poll_mode)
125 del_timer_sync(&ctrl->poll_timer);
127 free_irq(ctrl->pcie->irq, ctrl);
130 static int pcie_poll_cmd(struct controller *ctrl)
133 int err, timeout = 1000;
135 err = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
136 if (!err && (slot_status & PCI_EXP_SLTSTA_CC)) {
137 pciehp_writew(ctrl, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_CC);
140 while (timeout > 0) {
143 err = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
144 if (!err && (slot_status & PCI_EXP_SLTSTA_CC)) {
145 pciehp_writew(ctrl, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_CC);
149 return 0; /* timeout */
152 static void pcie_wait_cmd(struct controller *ctrl, int poll)
154 unsigned int msecs = pciehp_poll_mode ? 2500 : 1000;
155 unsigned long timeout = msecs_to_jiffies(msecs);
159 rc = pcie_poll_cmd(ctrl);
161 rc = wait_event_timeout(ctrl->queue, !ctrl->cmd_busy, timeout);
163 ctrl_dbg(ctrl, "Command not completed in 1000 msec\n");
167 * pcie_write_cmd - Issue controller command
168 * @ctrl: controller to which the command is issued
169 * @cmd: command value written to slot control register
170 * @mask: bitmask of slot control register to be modified
172 static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
178 mutex_lock(&ctrl->ctrl_lock);
180 retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
182 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
187 if (slot_status & PCI_EXP_SLTSTA_CC) {
188 if (!ctrl->no_cmd_complete) {
190 * After 1 sec and CMD_COMPLETED still not set, just
191 * proceed forward to issue the next command according
192 * to spec. Just print out the error message.
194 ctrl_dbg(ctrl, "CMD_COMPLETED not clear after 1 sec\n");
195 } else if (!NO_CMD_CMPL(ctrl)) {
197 * This controller semms to notify of command completed
198 * event even though it supports none of power
199 * controller, attention led, power led and EMI.
201 ctrl_dbg(ctrl, "Unexpected CMD_COMPLETED. Need to "
202 "wait for command completed event.\n");
203 ctrl->no_cmd_complete = 0;
205 ctrl_dbg(ctrl, "Unexpected CMD_COMPLETED. Maybe "
206 "the controller is broken.\n");
210 retval = pciehp_readw(ctrl, PCI_EXP_SLTCTL, &slot_ctrl);
212 ctrl_err(ctrl, "%s: Cannot read SLOTCTRL register\n", __func__);
217 slot_ctrl |= (cmd & mask);
220 retval = pciehp_writew(ctrl, PCI_EXP_SLTCTL, slot_ctrl);
222 ctrl_err(ctrl, "Cannot write to SLOTCTRL register\n");
225 * Wait for command completion.
227 if (!retval && !ctrl->no_cmd_complete) {
230 * if hotplug interrupt is not enabled or command
231 * completed interrupt is not enabled, we need to poll
232 * command completed event.
234 if (!(slot_ctrl & PCI_EXP_SLTCTL_HPIE) ||
235 !(slot_ctrl & PCI_EXP_SLTCTL_CCIE))
237 pcie_wait_cmd(ctrl, poll);
240 mutex_unlock(&ctrl->ctrl_lock);
244 static bool check_link_active(struct controller *ctrl)
249 if (pciehp_readw(ctrl, PCI_EXP_LNKSTA, &lnk_status))
252 ret = !!(lnk_status & PCI_EXP_LNKSTA_DLLLA);
255 ctrl_dbg(ctrl, "%s: lnk_status = %x\n", __func__, lnk_status);
260 static void __pcie_wait_link_active(struct controller *ctrl, bool active)
264 if (check_link_active(ctrl) == active)
266 while (timeout > 0) {
269 if (check_link_active(ctrl) == active)
272 ctrl_dbg(ctrl, "Data Link Layer Link Active not %s in 1000 msec\n",
273 active ? "set" : "cleared");
276 static void pcie_wait_link_active(struct controller *ctrl)
278 __pcie_wait_link_active(ctrl, true);
281 static void pcie_wait_link_not_active(struct controller *ctrl)
283 __pcie_wait_link_active(ctrl, false);
286 static bool pci_bus_check_dev(struct pci_bus *bus, int devfn)
290 int delay = 1000, step = 20;
294 found = pci_bus_read_dev_vendor_id(bus, devfn, &l, 0);
304 if (count > 1 && pciehp_debug)
305 printk(KERN_DEBUG "pci %04x:%02x:%02x.%d id reading try %d times with interval %d ms to get %08x\n",
306 pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
307 PCI_FUNC(devfn), count, step, l);
312 int pciehp_check_link_status(struct controller *ctrl)
319 * Data Link Layer Link Active Reporting must be capable for
320 * hot-plug capable downstream port. But old controller might
321 * not implement it. In this case, we wait for 1000 ms.
323 if (ctrl->link_active_reporting)
324 pcie_wait_link_active(ctrl);
328 /* wait 100ms before read pci conf, and try in 1s */
330 found = pci_bus_check_dev(ctrl->pcie->port->subordinate,
333 retval = pciehp_readw(ctrl, PCI_EXP_LNKSTA, &lnk_status);
335 ctrl_err(ctrl, "Cannot read LNKSTATUS register\n");
339 ctrl_dbg(ctrl, "%s: lnk_status = %x\n", __func__, lnk_status);
340 if ((lnk_status & PCI_EXP_LNKSTA_LT) ||
341 !(lnk_status & PCI_EXP_LNKSTA_NLW)) {
342 ctrl_err(ctrl, "Link Training Error occurs \n");
347 pcie_update_link_speed(ctrl->pcie->port->subordinate, lnk_status);
349 if (!found && !retval)
355 static int __pciehp_link_set(struct controller *ctrl, bool enable)
360 retval = pciehp_readw(ctrl, PCI_EXP_LNKCTL, &lnk_ctrl);
362 ctrl_err(ctrl, "Cannot read LNKCTRL register\n");
367 lnk_ctrl &= ~PCI_EXP_LNKCTL_LD;
369 lnk_ctrl |= PCI_EXP_LNKCTL_LD;
371 retval = pciehp_writew(ctrl, PCI_EXP_LNKCTL, lnk_ctrl);
373 ctrl_err(ctrl, "Cannot write LNKCTRL register\n");
376 ctrl_dbg(ctrl, "%s: lnk_ctrl = %x\n", __func__, lnk_ctrl);
381 static int pciehp_link_enable(struct controller *ctrl)
383 return __pciehp_link_set(ctrl, true);
386 static int pciehp_link_disable(struct controller *ctrl)
388 return __pciehp_link_set(ctrl, false);
391 int pciehp_get_attention_status(struct slot *slot, u8 *status)
393 struct controller *ctrl = slot->ctrl;
398 retval = pciehp_readw(ctrl, PCI_EXP_SLTCTL, &slot_ctrl);
400 ctrl_err(ctrl, "%s: Cannot read SLOTCTRL register\n", __func__);
404 ctrl_dbg(ctrl, "%s: SLOTCTRL %x, value read %x\n", __func__,
405 pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_ctrl);
407 atten_led_state = (slot_ctrl & PCI_EXP_SLTCTL_AIC) >> 6;
409 switch (atten_led_state) {
411 *status = 0xFF; /* Reserved */
414 *status = 1; /* On */
417 *status = 2; /* Blink */
420 *status = 0; /* Off */
430 int pciehp_get_power_status(struct slot *slot, u8 *status)
432 struct controller *ctrl = slot->ctrl;
437 retval = pciehp_readw(ctrl, PCI_EXP_SLTCTL, &slot_ctrl);
439 ctrl_err(ctrl, "%s: Cannot read SLOTCTRL register\n", __func__);
442 ctrl_dbg(ctrl, "%s: SLOTCTRL %x value read %x\n", __func__,
443 pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_ctrl);
445 pwr_state = (slot_ctrl & PCI_EXP_SLTCTL_PCC) >> 10;
462 int pciehp_get_latch_status(struct slot *slot, u8 *status)
464 struct controller *ctrl = slot->ctrl;
468 retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
470 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
474 *status = !!(slot_status & PCI_EXP_SLTSTA_MRLSS);
478 int pciehp_get_adapter_status(struct slot *slot, u8 *status)
480 struct controller *ctrl = slot->ctrl;
484 retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
486 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
490 *status = !!(slot_status & PCI_EXP_SLTSTA_PDS);
494 int pciehp_query_power_fault(struct slot *slot)
496 struct controller *ctrl = slot->ctrl;
500 retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
502 ctrl_err(ctrl, "Cannot check for power fault\n");
505 return !!(slot_status & PCI_EXP_SLTSTA_PFD);
508 int pciehp_set_attention_status(struct slot *slot, u8 value)
510 struct controller *ctrl = slot->ctrl;
514 cmd_mask = PCI_EXP_SLTCTL_AIC;
516 case 0 : /* turn off */
519 case 1: /* turn on */
522 case 2: /* turn blink */
528 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
529 pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
530 return pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
533 void pciehp_green_led_on(struct slot *slot)
535 struct controller *ctrl = slot->ctrl;
540 cmd_mask = PCI_EXP_SLTCTL_PIC;
541 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
542 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
543 pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
546 void pciehp_green_led_off(struct slot *slot)
548 struct controller *ctrl = slot->ctrl;
553 cmd_mask = PCI_EXP_SLTCTL_PIC;
554 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
555 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
556 pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
559 void pciehp_green_led_blink(struct slot *slot)
561 struct controller *ctrl = slot->ctrl;
566 cmd_mask = PCI_EXP_SLTCTL_PIC;
567 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
568 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
569 pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
572 int pciehp_power_on_slot(struct slot * slot)
574 struct controller *ctrl = slot->ctrl;
580 /* Clear sticky power-fault bit from previous power failures */
581 retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
583 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
587 slot_status &= PCI_EXP_SLTSTA_PFD;
589 retval = pciehp_writew(ctrl, PCI_EXP_SLTSTA, slot_status);
592 "%s: Cannot write to SLOTSTATUS register\n",
597 ctrl->power_fault_detected = 0;
600 cmd_mask = PCI_EXP_SLTCTL_PCC;
601 retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
603 ctrl_err(ctrl, "Write %x command failed!\n", slot_cmd);
606 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
607 pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
609 retval = pciehp_link_enable(ctrl);
611 ctrl_err(ctrl, "%s: Can not enable the link!\n", __func__);
616 int pciehp_power_off_slot(struct slot * slot)
618 struct controller *ctrl = slot->ctrl;
623 /* Disable the link at first */
624 pciehp_link_disable(ctrl);
625 /* wait the link is down */
626 if (ctrl->link_active_reporting)
627 pcie_wait_link_not_active(ctrl);
631 slot_cmd = POWER_OFF;
632 cmd_mask = PCI_EXP_SLTCTL_PCC;
633 retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
635 ctrl_err(ctrl, "Write command failed!\n");
638 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
639 pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
643 static irqreturn_t pcie_isr(int irq, void *dev_id)
645 struct controller *ctrl = (struct controller *)dev_id;
646 struct slot *slot = ctrl->slot;
647 u16 detected, intr_loc;
650 * In order to guarantee that all interrupt events are
651 * serviced, we need to re-inspect Slot Status register after
652 * clearing what is presumed to be the last pending interrupt.
656 if (pciehp_readw(ctrl, PCI_EXP_SLTSTA, &detected)) {
657 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS\n",
662 detected &= (PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD |
663 PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_PDC |
665 detected &= ~intr_loc;
666 intr_loc |= detected;
669 if (detected && pciehp_writew(ctrl, PCI_EXP_SLTSTA, intr_loc)) {
670 ctrl_err(ctrl, "%s: Cannot write to SLOTSTATUS\n",
676 ctrl_dbg(ctrl, "%s: intr_loc %x\n", __func__, intr_loc);
678 /* Check Command Complete Interrupt Pending */
679 if (intr_loc & PCI_EXP_SLTSTA_CC) {
682 wake_up(&ctrl->queue);
685 if (!(intr_loc & ~PCI_EXP_SLTSTA_CC))
688 /* Check MRL Sensor Changed */
689 if (intr_loc & PCI_EXP_SLTSTA_MRLSC)
690 pciehp_handle_switch_change(slot);
692 /* Check Attention Button Pressed */
693 if (intr_loc & PCI_EXP_SLTSTA_ABP)
694 pciehp_handle_attention_button(slot);
696 /* Check Presence Detect Changed */
697 if (intr_loc & PCI_EXP_SLTSTA_PDC)
698 pciehp_handle_presence_change(slot);
700 /* Check Power Fault Detected */
701 if ((intr_loc & PCI_EXP_SLTSTA_PFD) && !ctrl->power_fault_detected) {
702 ctrl->power_fault_detected = 1;
703 pciehp_handle_power_fault(slot);
708 int pcie_enable_notification(struct controller *ctrl)
713 * TBD: Power fault detected software notification support.
715 * Power fault detected software notification is not enabled
716 * now, because it caused power fault detected interrupt storm
717 * on some machines. On those machines, power fault detected
718 * bit in the slot status register was set again immediately
719 * when it is cleared in the interrupt service routine, and
720 * next power fault detected interrupt was notified again.
722 cmd = PCI_EXP_SLTCTL_PDCE;
723 if (ATTN_BUTTN(ctrl))
724 cmd |= PCI_EXP_SLTCTL_ABPE;
726 cmd |= PCI_EXP_SLTCTL_MRLSCE;
727 if (!pciehp_poll_mode)
728 cmd |= PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE;
730 mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE |
731 PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
732 PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE);
734 if (pcie_write_cmd(ctrl, cmd, mask)) {
735 ctrl_err(ctrl, "Cannot enable software notification\n");
741 static void pcie_disable_notification(struct controller *ctrl)
744 mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE |
745 PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
746 PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE |
747 PCI_EXP_SLTCTL_DLLSCE);
748 if (pcie_write_cmd(ctrl, 0, mask))
749 ctrl_warn(ctrl, "Cannot disable software notification\n");
752 int pcie_init_notification(struct controller *ctrl)
754 if (pciehp_request_irq(ctrl))
756 if (pcie_enable_notification(ctrl)) {
757 pciehp_free_irq(ctrl);
760 ctrl->notification_enabled = 1;
764 static void pcie_shutdown_notification(struct controller *ctrl)
766 if (ctrl->notification_enabled) {
767 pcie_disable_notification(ctrl);
768 pciehp_free_irq(ctrl);
769 ctrl->notification_enabled = 0;
773 static int pcie_init_slot(struct controller *ctrl)
777 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
782 mutex_init(&slot->lock);
783 INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
788 static void pcie_cleanup_slot(struct controller *ctrl)
790 struct slot *slot = ctrl->slot;
791 cancel_delayed_work(&slot->work);
792 flush_workqueue(pciehp_wq);
796 static inline void dbg_ctrl(struct controller *ctrl)
800 struct pci_dev *pdev = ctrl->pcie->port;
805 ctrl_info(ctrl, "Hotplug Controller:\n");
806 ctrl_info(ctrl, " Seg/Bus/Dev/Func/IRQ : %s IRQ %d\n",
807 pci_name(pdev), pdev->irq);
808 ctrl_info(ctrl, " Vendor ID : 0x%04x\n", pdev->vendor);
809 ctrl_info(ctrl, " Device ID : 0x%04x\n", pdev->device);
810 ctrl_info(ctrl, " Subsystem ID : 0x%04x\n",
811 pdev->subsystem_device);
812 ctrl_info(ctrl, " Subsystem Vendor ID : 0x%04x\n",
813 pdev->subsystem_vendor);
814 ctrl_info(ctrl, " PCIe Cap offset : 0x%02x\n",
816 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
817 if (!pci_resource_len(pdev, i))
819 ctrl_info(ctrl, " PCI resource [%d] : %pR\n",
820 i, &pdev->resource[i]);
822 ctrl_info(ctrl, "Slot Capabilities : 0x%08x\n", ctrl->slot_cap);
823 ctrl_info(ctrl, " Physical Slot Number : %d\n", PSN(ctrl));
824 ctrl_info(ctrl, " Attention Button : %3s\n",
825 ATTN_BUTTN(ctrl) ? "yes" : "no");
826 ctrl_info(ctrl, " Power Controller : %3s\n",
827 POWER_CTRL(ctrl) ? "yes" : "no");
828 ctrl_info(ctrl, " MRL Sensor : %3s\n",
829 MRL_SENS(ctrl) ? "yes" : "no");
830 ctrl_info(ctrl, " Attention Indicator : %3s\n",
831 ATTN_LED(ctrl) ? "yes" : "no");
832 ctrl_info(ctrl, " Power Indicator : %3s\n",
833 PWR_LED(ctrl) ? "yes" : "no");
834 ctrl_info(ctrl, " Hot-Plug Surprise : %3s\n",
835 HP_SUPR_RM(ctrl) ? "yes" : "no");
836 ctrl_info(ctrl, " EMI Present : %3s\n",
837 EMI(ctrl) ? "yes" : "no");
838 ctrl_info(ctrl, " Command Completed : %3s\n",
839 NO_CMD_CMPL(ctrl) ? "no" : "yes");
840 pciehp_readw(ctrl, PCI_EXP_SLTSTA, ®16);
841 ctrl_info(ctrl, "Slot Status : 0x%04x\n", reg16);
842 pciehp_readw(ctrl, PCI_EXP_SLTCTL, ®16);
843 ctrl_info(ctrl, "Slot Control : 0x%04x\n", reg16);
846 struct controller *pcie_init(struct pcie_device *dev)
848 struct controller *ctrl;
849 u32 slot_cap, link_cap;
850 struct pci_dev *pdev = dev->port;
852 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
854 dev_err(&dev->device, "%s: Out of memory\n", __func__);
858 if (!pci_pcie_cap(pdev)) {
859 ctrl_err(ctrl, "Cannot find PCI Express capability\n");
862 if (pciehp_readl(ctrl, PCI_EXP_SLTCAP, &slot_cap)) {
863 ctrl_err(ctrl, "Cannot read SLOTCAP register\n");
867 ctrl->slot_cap = slot_cap;
868 mutex_init(&ctrl->ctrl_lock);
869 init_waitqueue_head(&ctrl->queue);
872 * Controller doesn't notify of command completion if the "No
873 * Command Completed Support" bit is set in Slot Capability
874 * register or the controller supports none of power
875 * controller, attention led, power led and EMI.
877 if (NO_CMD_CMPL(ctrl) ||
878 !(POWER_CTRL(ctrl) | ATTN_LED(ctrl) | PWR_LED(ctrl) | EMI(ctrl)))
879 ctrl->no_cmd_complete = 1;
881 /* Check if Data Link Layer Link Active Reporting is implemented */
882 if (pciehp_readl(ctrl, PCI_EXP_LNKCAP, &link_cap)) {
883 ctrl_err(ctrl, "%s: Cannot read LNKCAP register\n", __func__);
886 if (link_cap & PCI_EXP_LNKCAP_DLLLARC) {
887 ctrl_dbg(ctrl, "Link Active Reporting supported\n");
888 ctrl->link_active_reporting = 1;
891 /* Clear all remaining event bits in Slot Status register */
892 if (pciehp_writew(ctrl, PCI_EXP_SLTSTA, 0x1f))
895 /* Disable sotfware notification */
896 pcie_disable_notification(ctrl);
898 ctrl_info(ctrl, "HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n",
899 pdev->vendor, pdev->device, pdev->subsystem_vendor,
900 pdev->subsystem_device);
902 if (pcie_init_slot(ctrl))
913 void pciehp_release_ctrl(struct controller *ctrl)
915 pcie_shutdown_notification(ctrl);
916 pcie_cleanup_slot(ctrl);